Roofing.



EDWARD J. scnnonnn, or CHICAGO, ILtmoIs.

ROOFING.

No Drawing.

To all whom it may concern:

Be it known that L EowAno J. SoHRoDER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Roofing, of Whlch. the following is a specification.

, The article of commerce termed prepared or ready roofing comprises a sheet of suitable material saturated with asphalt or a similar Waterproofing substance. Afsheet material commonly used in roofing is that known as wool felt. In endeavoring to pro vide a cheap and satisfactory substitute for W001 felt, I have produced a felt of novel characteristics which is, not only less expensive than wool felt,-but possesses features of superiority thereto. The new felt contains chemical fiber from southern yellow pine, (long-leaf, loblolly and jack pine) which are rich in resinoussubstances. The felt may consist entirely of such chemical resinous-wood fiber, or may contain a' greater or less quantity of other fibers or rags. I prefer that the felt should consist entirel it be esired to reduce the cost of the felt,- other fibers or rags may be used in combination with the chemical. southern yellow pine fiber.- The felt should, however, contain not less than fifty per cent. of chemical southern yellow pine fiber.

The new felt referred to is much than wool felt. Prior to saturation, the bursting strain, per square inch on a, Mullen tester, of a sheet of average'wool felt, is six-tenths pounds per one-thousandth of an inch in thickness, whereas the bursting strain of a sheet of the pure wood felt herethickness.

inbefore described is two and two-tenths pounds, per one-thousandth of an inch in The bursting strain of wood felt which does not consist wholly of chemical southern yellow pine fiber will vary according to the kinds of fibers and the relative proportions. of the different sorts of fibers contained in the sheet.

The wood felt may be made in various gages according to the character of the'roofing to in the form of shingles. of the wood fiber specified, but if,

stronger be made, the range in .gage beingfrom about 0.035 to: 0.100. The gage and 3 the weight of the wood felt are ordina- Specification of Letters Patent. Patented June 9 1916, Application filed January 21, 1914. Serial No. 813,395.

rily so proportioned as to permit of the standard 150% saturation. The. greater strength of-wood felt as compared with Wool felt is of advantage in the manufac ture of. roofing, in that more tension can be put on the web for the purpose of making the Web run straight, thus avoiding the damtain relatively large f resin ducts which, being substantially. emptied of resin in" the chemical process of producing wood pulp,

are able to absorb and retain a correspondingly large amount of waterproofing.

The wood felt herein described is stifl'er than wool felt, its rigidity being especially advantageous in roofing intended to be laid Being relatively stiff, shingles having a body of wood felt such as that herein set forth are not so apt to be injured by the windas are shingles formed of wool felt.

It will be seen that, I have produced a substitute for wool felt which is not only cheaper but is superior -to wool felt in strength, rigidity and wearing qualities.

I claim as my invention:

1. An improved roofing material comprising a wood felt containing 'not. less than about fifty percent. of chemical southern resinous-wood fiber, and impregnated with a waterproofing substance. 0

.2 An improved roofing material comprising a wood felt containing more than fifty per cent. of yellow pine fibers and impregnated with a waterproofing substance.

3. A roofing material consisting of a felt.- ed sheet of yellow pine fibers substantially saturated wlth constituents of coal tar.

In testimonywhereof I aflix my signature in the presence of two witnesses.

EDWARD J. SCHRODER.

' Witnesses: r

CHARLES W. HILLS, 5n, GEORGE L. CHINDAHL. 

